Comparison between semiclassical and full quantum transport analysis of THz quantum cascade lasers
Comparison between semiclassical and full quantum transport analysis of THz quantum cascade lasers
复制标题
DOI：
10.1016/j.physe.2009.12.028
复制
发表时间：
2010-09-01
影响因子：
3.3
通讯作者：
Jirauschek, Christian
中科院分区：
文献类型：
--
作者：
Matyas, Alpar;Kubis, Tillmann;Jirauschek, Christian
我们实现并比较了量子级联激光器和斯塔克阶梯中稳态电子输运的两种理论模型。第一种方法是非平衡绿色函数方法，它是一种非常普遍的方法，可以自洽地包括相干量子力学和声子与器件缺陷的非相干散射。然而，它在数值上要求很高，不能用于系统的器件参数扫描。出于这个原因，我们还实现了近似的，数值高效的系综蒙特卡罗方法，并评估其适用性对上述运输问题。我们确定了一个运输制度，这两种方法的结果定量一致。在这种情况下，系综蒙特卡罗方法非常适合提出设计改进。(C)2009 Elsevier B.V.保留所有权利。
We implement and compare two theoretical models for stationary electron transport in quantum cascade lasers and Stark ladders. The first one, the nonequilibrium Green's function method is a very general scheme to include coherent quantum mechanics and incoherent scattering with phonons and device imperfections self-consistently. However, it is numerically very demanding and cannot be used for systematic device parameter scans. For this reason, we also implement the approximate, numerically efficient ensemble Monte Carlo method and assess its applicability on the above mentioned transport problems. We identify a transport regime in which results of both methods quantitatively agree. In this regime, the ensemble Monte Carlo method is well suited to propose design improvements. (C) 2009 Elsevier B.V. All rights reserved.